Automatic safety-valve.



W. WAFER.

AUTOMA TIC SAFETY VALVE. APPLICATION FILED n30.s,1912.

1,071,972. Patented Sept. 2, 1913.

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AUTOMATIC SAFETY VALVE.

APPLICATION FILED DEC. 6, 1912 1,071,972. Patented Sept. 2, 1913.

INVENTOR m K AN wdw ATTORNEY WILLIAM WAFER, 03' OAK PARK, ILLINOIS.

AUTOMATIC SAFETY-VALVE.

new and useful Improvements in Automatic Safet -Valves, of which the following is a readily.

,val during which the valve remains open provide a pop valve which speci cation.

My invention relates to valves for regulating fluid pressure, but more particularly to that class of valves used for automatically relievingany excess of pressure in a steam boiler so as to keep the steam pressure from exceeding a predetermined amount.

intervals of time,

may easily occur at brief pop valves, but

are commonly known as have heretofore been limited in their use? owing to the complications involved 1n the timin or adjusting features of such valves and t e consequent hi h cost of the same.

The chief objects 0 my invention are to will be simple and easy of manufacture; easy to clean or repair; and which can be adjusted to vary the time interwhen actuated, thereby varying the amount by which the pressure in the boiler is reduced during the time that the valve was open.

I attain these objects by the construction shown in the accompanying drawings, forminga part of this specification, and in which Figure 1 is a side elevation of my valve, with the casing and spring in section; Fig. 2 is a top plan view; Fig. 3 is a vertical sectional view of the valve; Fi 4 is a horizontal section taken through Tig. 3 along the line 4-4; Fig. 5 is a bottom plan view of the valve proper.

In its preferred form, my invention consists of a body 1, provided at its lower end with a female thread 2, for attaching it to a steam pipe of a locomotive, or other steam boiler. Immediately above the said inner thread 2, and preferably somewhat eater in diameter, is a cylindrical bore 3, ormed in the body casting 1, and in which bore 3 the guide for the valve plunger is adapted to reciprocate. This valve plunger consists of a lower guide portion, an upper outlet pipe, and a hollow chamber between the two. The lower guide portion preferably consists Specification of Letters I'atent. Application filed December 8, 1812. Serial No. 785,252.

Such safety valves, when designed to be actuated. by the slight excess in steam pressure which 1 which will be screwed into the top Patented Sept. 2, 1913.

of a luralit of vertical wings 4, arranged radio. ly to t e axis of the valve, thesewings belng turned at their outer ed es to conform to the contour of the bore 3 o thebody 1 of the valve. Above the upper ends of these wings, the plunger has a beveled face 5, shaped to match a beveled valve seat 6, formed on the body casting 1, around the upper end of the bore 3, thereof, so thatthe two will form a closure when the plunger is depressed. ,Above the face 5, and outwardly of the same is a downwardl extending flanged ring 7, which has a ower sharp edge forming a lip 8, which, when the valve is closed, sets upon a beveled seat 9, formed around the upper outer edge of the body 1. Perforations 10, lead from a number of points within this flanged rim 7, to a hollow chamber 11 within the punger from which chamber 11, a vent pipe 12, leads upward through the top of the valve casing 13. Surrounding this pipe 12, is a spring 14, bearing at its lower end against the disk 15, which, in turn, bears against the top of the valve plunger, and at its upper end against a disk 16. This disk 16, rests against the inner end of-a bushing 17, of the valve casing 13, and locked in position by a jamb-nut 18. Near its upper end the vent pipe 12, is provided with a series of perforations 19, and is internally threaded to receive an adjusting screw 20.

Surrounding the part of the body 1, just below the valve seat 6, is an annular trough 21,. preferably rounded at its lower end as shown in Fig. 3, the outer edge of the trough being formed by an outer cylindrical portion 22, of the valve casing. This outer portion 22, is connected to the main portion 13, of'the valve casing by radial webs 23, and is screwed at its lower end to the body 1, just below the said trough 21.

In addition to the guide wings 4, the plunger also has an added guide portion 24, sliding within the valve casing 13, at its lower end, there being suitable vents 25, in

.the top of the casingto prevent a comprestrapped steam is' .su'fiicientl y reduced by I 35 take place is readily controlled by the screw When the steam pressure exceeds the tension 7 for which the spring ised iusted, by the ;p.osition of the bushing, it Wlll lift the plunger, thereby allowing steam to issue :firomrther bore 3, of the valve body 1, against thedownw'ard-ly zfianged ring 7, which -w1.l1 direct it downward and outward into -the annular trough 21. The latter, in turn, will deflect the steam in an upward direction so 10 that it will pass out between the concentric portions 13 and 22 of the valve .cas'ing. Steam will also enter the hollow chamber of the valve plunger through -the perforations 10, and w1l-l then pass up the vent pipe '12,

15 and out throu h the sm'a-ll perforations 19. As soon es en e'ient-steam has escaped "from the boiler "in this way to relieve the excess of pressure needed :to overcome the :normal -tension of the spring 14, {this spring will tend to return the valve plunger to its seated position. In so doing it will compressthe steam which is in the chamber 11, the vent pipe F12, and the annular space 26, bouuadcd by the valve -ffiaee "5, -the flangedring 7, and

the upper face of the valve body '1. Wen thus suddenly compressed the steam inclosedl in the passage just mentioned will form a cushion to resist the closure of the valve plunger, thus holding the valve slightly'od its seat until the pressure of the said on leakage through the small perforations 19,

. in the upper end of the'vent pipe 12, The

ieng-thof time requircdfor this leakage to.

- 20, which may 'bemoved to open a larger or smaller number oftlheperfora't'ions 1"9. If these perforations 919, do not relieve the pressure of the entrapped steam fast enough to 40 allow the valve :to close as quickly as d sired,

they may he supplemented 'byauxiliaryperforations 27, leading from the annular passage 26 as shown 15y dotted lines in Figs, aeandaf It will be-obvious :the ahove description and accompanying drawings that a valve constructed in'accordance with my invemtion is easy to make and has'very few parts; that it can be easily adjusted as to its actuating ressure by moving the bushing 17, and as to its time of pressure-relieving; or the number of pounds of pressure allowed to escape from the boiler after the actuatin pressure is overcome, by adjusting the screw 20,1;0 throttle the ventpipe 12, more or less. By suita oly setting the screw 20, the time requined for the valve to close can easily he lengthened so that valve will not only relieve the actual excess of boiler pressure required for operating the valve, but will lessen the pressure b one or several pounds below that at whicli the valve opened It will also be evident from the drawings that the flanged ring 7, and the annular trough substantially vertical direction so that it will have ifinee passage to the air through the space between the portions 13 and 22 of the va ve...

While I .have shown and described my opad m,im its preferred embodiment, Ldo not wish to be limited to the precise details disclosed, he'ing evident, that various modifications may be made in various parts of the device Without departing lirom 'the spirit-off my invention.

Having thus 'fully described my invention, what l claim as new and desire to secure hy Letters Patent 'is- '1. in a safety pop vallve having 'a valve seat, at reciprocal plunger adapted to form a closure when depressed against the valve seat, and to limit steam when raised from the said valve seat "by the pressure of steam upon the plunger, there being a downwardly open annular grooved format-ion upon the plunger adj acent to its engagement with the valve seat-said plunger-also'havi-ng a chamber formed with-in the same :a'bove said annular groove and connected with the said grooved -formation by perforations, and a vent pipe canfied by the plunger and connected {with the said cham'ber.

2. 'En a 'saffiety pop valve having a valve seat, a reciprocal plunger adapted'to term a closure when depressed against the valve seat, and 'to limit steam when raised from the said valve seat by the pressure of steam upon the plunger, there being a downwardly open annular grooved formation upon the plunger adjacent to its engagement w'i'flh the valve seat,, said plunger also havin a chamleer -=within the same connected wit" the said grooved formation by perforations, a vent pipe carried by the plunger and connected with the said chamber, and adjustable means eam'ied 'hy said vent pipe for throttling the same.

3. In a safety pop valve for steam boilers having a valve seat, a reciprocable interim-1y n chambered. plunger having an annular grooved formation adjacent to its engagewith the valve seat, and hav' the interior cliamdcer connected with t e said grooved iormatison icy perforations, the said plunger having a throttled vent connected with the said interior cham ber, the said grooved formation and chamber being adapted to entra steam under pressure when the plunger 1s forced toward the valve 120 seat, and a spring tending to press the plunger into engagement with the valve seat.

' 4- lie a steam safetpop valve having a "valve seat, an interim y chambered plunger adapted to make a closure with the valve seat, there lacing 4 assages adjacent to the closure for provi mg a rapid entrance for steamvinto the said interior chamber, and

c5 eoote to elect-the escaping steam inaa passage for providing-a slow leak e at st a from the-sal d cham her a we 5. In a steam safety pop valve having a In witness whereof, I have hereunto sub- 10 valve seat, an interiorly chambered plunger scribed my name this 30th day of November adapted .to make a closure with the valve 1912, in the presence of two subscribing witseat, there being passages adjacent to the nesses. closure for providing a rapid entrance for steam into the said interior chamber, and an adjustably throttled passage for providing Witnesses: a slow leakage of steam from the said cham- CHAS. C. TILLMAN, her. A. S. PHILLIPS.

WILLIAM WAFER. 

